Means for reproducing motion



J. D. PETERSON MEANS FOR REPRODUCING MOTION July 6, 1943.

Filed Aug. 25, 1942 (J wN $55 3: QSNGQMRN u v HTTORIVE'X Patented July 6, 1943 UNITED STATES PATENT OFFICE 2,323,566 MEANS roa nsraonucmq MOTION Joel D. Peterson, Ridgewood, N. J., asslgnor to Bendix Aviation Corporation, Bendix, N. 1., a corporation of Delaware Application August 25, 1942, Serial No. 456,065

7 Claims. (Cl. 172-239) The present invention relates to means for reproducing motion, and more particularly to novel and improved means for reproducing angular motion at a remote point for indicating and/or control purposes.

One of the objects of the invention is to provide novel means for reproducing motion, constituting an improvement over the means disclosed in the patent to W. A. Reichel, No. 2,269,602 dated January 13, 1942, and in co-pending application Serial No. 450,595 filed July 11, 1942, said patent and application being assigned to the same assignee as the present invention.

Another object is to provide novel and improved means for reproducing motion employing a transmitter of the type disclosed in the aforesaid patent to Reichel, No. 2,269,602 which employs a periodically varying or alternating current for energization thereof, and electrically connected to a remote receiver of an alternating current type having a stator winding on a core of insulating material and a. cooperating rotor of normally unmagnetized magnetically permeable material, such as a soft iron vane, for example.

A further object is to provide novel means for reproducing angular motion at a remote point, comprising a transmitter energized by an alternating current of fundamental frequency and electrically connected to a remote receiver energized by an alternating current which is an even harmonic of the fundamental frequency.

Still another object of the invention is to provide novel means for reproducing angular motion at a remote point, employing a transmitter of the type disclosed in the aforesaid patent to Reichel No. 2,269,602, electrically connected to a novel remote receiver comprising a stator having a core of insulating material with windings thereon, and

a rotor of unmagnetized magnetically permeable material. I

The foregoing and other objects and advantages of .the inventionwill appear more fully hereinafter from a consideration oi. the detailed description which follows, taken together with the accompanying drawing wherein one embodi ment of the invention is illustrated by way of example. It is to be expressly understood, however, that the drawing is for purposes of illustration only and are not to be construed as defining the limits of the invention, reference being had for this purpose to the appended claims.

In the drawing: l l

Fig. 1 is a more or less diagrammatic illustration of one embodiment of the invention; and

Fig. 2 is a cross section of the remote receiver,

taken on line 2--2 01' Fig. 1.

The invention consists substantially in the construction, combination, location and relative arrangement of parts and circuits for obtaining the results desired in accordance with the foregoing objects, as will be more fully hereinafter set forth in the specification, as shown in the drawings by way of example, and as finally pointed out in the claims.

Referring now to the drawing and more particularly to Fig. 1, the novel apparatus embodying the invention comprises, in the form shown, an alternating current type of transmitter 3, including a. stator having an annular core 4 of highly I permeable magnetic material such as "Permalloy or Mu-metal, for example, on which is wound a single phase primary or exciting winding 5 over the entire circumference thereof, said exciting or energizing winding I being connected for energization by an alternating current of fundamental frequency from supply leads 6 and l by. leads 8 and 9 which are also connected to a frequency doubler of any suitable type shown diagrammatically at l0. By virtue of the alternating current flowing in the single phase energizing winding 5, the permeable core member 4 is periodically saturated at a frequency corresponding to the frequency oi said alternating current.

Wound over said energizing winding Sand in inductive relation therewith are three windings ll I 2 and i3 which are connected in three-phase relation at a junction point l4 to form a Y-conin Fig. 1. These fluxes then combine and emerge from the core member at the south end of the rotor where they enter the latter. The magnet rotor IS, in the present embodiment, is shown in the form of a disc, the upper half of which constitutes the north pole and the lower half the south pole thereof.

In the event that it is desired to transmit the indications of a magnetic compass to the remote point, the magnet rotor I! may be dispensed with, and the stator 4 placed under or above the compass in influencing relation with the compass magnet. whereby the latter then becomes the rotor oi the transmitter.

Likewise the transmitter 3 may be used as an earth inductor, in which event the rotor I5 may again be dispensed with and the stator placed in a horizontal position and arranged so as to be traversed by the earths magnetic field, the lat ter then traversing the core member 4 in the same manner as the uni-directional field of the magnet rotor |5, but in that case the field obviously remains stationary and the stator is then moved angularly in azimuth with the craft on which it may be mounted inrelatively fixed relation therewith.

The remote receiver of the invention, shown at l6, comprises a stator I! of insulating material such as "Bakelite," for example, in the form of a cylindrical shell on which is wound a single circuit energizing winding l8 over the entire circumference thereof with its turns concentric and co-axial with said insulating core i1.

Wound over said energizing Winding i8 and in inductive relation therewith are three windings I9, and 2| which are connected in three phase relation at the junction point 22 to form a Y-connected three-phase type of winding, and the turns of said windings extending in a direction transversely of the energizing winding l8 as shown diagrammatically in Fig. 1.

The receiver stator windings I9, 20 and 2| are electrically connected to the transmitter stator windings I2 and I3 by means of leads 23, 24 and 25 respectively, while the energizing winding N3 of said receiver stator is electrically connected to the output of the frequency doubler ill by means of leads 28 and 21 for energization by an alternating current having a frequency which is twice that of the alternating current which energizes the exciting winding 5 of the transmitter.

Concentrically arranged within the stator core member ll of insulating material and in electromagnetic relation with the energizing winding l8 and the Y-connected windings I9, 20 and 2|, is a rotor 28 in the form of a Z-shaped vane of magnetic material such as soft iron, for example, and carried by a shaft 28 which may be journalled in any suitable manner and which may be drivably connected to an indicator (not shown) in the event that the system is used for remote indication, or to a control element (not shown) in the event that-the system is to be used for remote control purposes.

Upon energization of the exciting winding 5 of the transmitter 3 by the alternating current, voltages are generated in the three output windings I I, I2 and |3 due to the periodic reversal of the flux produced in the core 4 by said energizing current, because of the fact that during one half-cycle of said current the periodically reversing flux opposes the uni-directional fiux of the magnet rotor IS in one half of said core 4 and at the same time aids said uni-directional fiux in the other half of said core, while during the other half-cycle of said exciting current, said periodically reversing flux aids the uni-directional flux of the magnet rotor l5 in the one half of said core 4 and at the same time opp ses said uni-directional flux in the other half of said core, as fully explained in the aforesaid patent to Reichel No. 2,269,602.

The voltages thus generated in the output windings |l. l2 and 3 by the flux variations in core 4 are even harmonics, mostly second harmonics, of the fundamental frequency of the exciting current. These second harmonic voltages are in phase and vary only in magnitude with the position of the magnet rotor IS with respect to the three windings I I, I2 and I3 which are an gularly spaced apart around said core 4 and, hence, with respect to the rotor |5.

Since the output voltages from coils ll, [2 and I3 are second harmonics of the fundamental frequency of the exciting current flowing in the input coil 5 of the transmitter 3, and energize the windings I9, 20 and 2| of the receiver stator, the energizing current in receiver stator coil l8 must be of the same frequency as said output voltages. For this reason the frequency doubler I0 is employed in order to double the frequency of the alternating current from the same source from which the energizing winding 5 of the transmitter is energized.

By virtue of the fact that the receiver stator windings |9, 20 and 2| are energized from the output windings ll, l2 and I3 of the transmitter, a resultant magnetic field is produced at said receiver stator having a relative angular direction corresponding to that of the magnetic field at the transmitter, while the receiver stator energizing winding l8 induces magnetic poles in the ends of the rotatable vane 28, whereby said vane is actuated to an angular position corresponding to the direction of the magnetic field at the transmitter.

Novel means are thus provided for transmitting motion from one point to another and remote point, and particularly for transmitting angular motion for indicating and/or control purposes, whereby the core of the remote receiver stator may be made of insulating material instead of magnetic material and whereby the receiver rotor need not be a magnet.

Although one embodiment of the invention has been specifically illustrated and described, various changes and modifications in the form, construction and relative arrangement of parts and circuits, which will now become apparent to those skilled in the art, may be made without departing from the scope of the invention. Reference is therefore to be had to the appended claims for a definition of the limits of the invention.

What is claimed is:

I. In combination, atransmitter of the alternating current type having core means of magnetically permeable material arranged to be traversed by a uni-directional magnetic field for inducing a magnetic flux therein, said core means and uni-directional magnetic field being relatively angularly movable, coil means wound on said core means and having single circuit input connections and a plurality of equally angularly spaced output connections about said core means, a source of alternating current connected to energize the input of said coil means for periodically varying the magnetic flux in said core means, whereby an alternating voltage is induced in each of the outputs of said coil means. having a frequency which is twice the frequency of said source and having a magnitude which is a function of the relative angular relation between said core means and the uni-directional magnetic field, and a remote receiver of the alternating current type comprising a stator havmg core means of insulating material, coil means wound on said core means of insulating material and also having single circuit connections and a plurality of equally angularly spaced multimeans, the output connections of said transmitter coil means being electrically connected to the corresponding multi-circuit connections of said receiver coil means, a frequency doubler having its input connected to said source of alternating current and its output to the single circuit connections of said receiver coil means, whereby the latter produces a resultant magnetic field having an angular direction corresponding to the direction of the magnetic field at the transmitter with respect to the core means thereof, and a receiver rotor actuated by said resultant magnetic field to an angular position corresponding to the direction of the magnetic field at said transmitter.

2. In combination, a transmitter of the alternating current type having core means of magnetically permeable material arranged to be traversed by a uni-directional magnetic field for inducing a magnetic flux therein, said core means and uni-directional magnetic field being relatively angularly movable, coil means wound on said core means and having single circuit input connections and a plurality of equally angularly spaced output connections about said core means, a source of alternating current connected to energize the input of said coil means for periodically varying the magnetic flux in said core means, whereby an alternating voltage is induced in each of the outputs of said coil means, having a frequency which is an.even harmonic of the frequency of said source and having a magnitude which is a function of the relative angularrelation between said core means and said uni-directional magnetic field, and a remote receiver of the alternating current type comprising a stator having core means of insulating material, coil means wound on said core means of insulating material and also having single circuit connections and a plurality of equally angularly spaced multi-circuit connections corresponding to the number of output connections of the transmitter coil means, the output connections of said transmitter coil means being electrically connected to the corresponding multi-circult connections of said receiver coil means, a frequency multiplier having its input connected to said source of alternating current and its output to the single circuit connections of said receiver coil means, whereby the latter produces a resultant magnetic field having an angular direction corresponding to the direction of the magnetic field at the transmitter with respect to the core means thereof, and a receiver rotor actuated by said resultant magnetic field to an angular positioncorresponding to the direction of the magnetic field at said transmitter.

3. In combination, a transmitter of the alternating current type having an annular core of magnetically permeable material arranged to be traversed by a uni-directional magnetic field for inducing a magnetic flux therein, said core and uni-directional magnetic field being relatively angularly movable, an alternating current input winding wound on said core around its circumference, a plurality of equally angularly spaced alternating current output windings wound on said core in inductive relation with said input winding, an alternating current source connected to energize said input winding for periodically varying the magnetic flux in said core, whereby an alternating voltage is induced in each of said output windings which is an even harmonic of the fundamental frequency of said source and the m s itude of which is a function of the relative angular relation between said core and said uni-directional magnetic field, and a remote receiver of the alternating current type comprising a stator having an annular core of insulating material, an alternating current energizing winding wound on said core of insulating material, a plurality of equally angularly spaced alternating current windings wound on said core of insulating material in inductive relation with said energizing winding and corresponding in number to the number of output windings on the core of said transmitter, the plurality of the output windings of said transmitter being electrically connected to the corresponding plurality of windings of said receiver, a frequency multiplier having its input connected to said source of alternating current and its output to the energizing winding of said receiver, whereby the plurality of windings of said receiver produces a resultant magnetic field having an angular direction corresponding'to the direction of the magnetic field at the transmitter with respect to the core thereof, and a receiver rotor actuated by said resultant magnetic field to an angular position corresponding to the direction of the magnetic field at said transmitter.

4. In combination, a transmitter of the alternating current type having an annular core of magnetically permeable material arranged to be traversed by a uni-directional magnetic field for inducing a magnetic flux therein, said core and uni-directional magnetic field being relatively angularly movable, an alternating current input winding wound on said core around its circumference, a plurality of equally angularly spaced alternating current output windings wound on said core in inductive relation with said input windings, an alternating current source connected to energize said input winding for periodically varying the magnetic fiux in said core, whereby an alternating voltage is induced in each of said output windings which has a frequency twice that of the fundamental frequency of said source and the magnitude of which is a function of the relative angular relation between said core and said uni-directional magnetic field, and a remote receiver of the alternating current type com prising a stator having an annular core of insulating material, an alternating current energizing winding wound on said core of insulating material, a plurality of equally angularly spaced alternating current windings wound on said core of insulating material in inductive relation with said energizing winding and corresponding in number to the number of output windings on the core of said transmitter, the plurality of the output windings of said transmitter being electrically connected to the corresponding plurality of windings of said receiver, a frequency doubler having its input connected to said source of alternating current and its output to the energizing winding of said receiver, whereby the plu rality of windings of said receiver produces a resultant magnetic field having an angular direction corresponding to the direction of the magnetic field at the transmitter with respect to the core thereof, and a receiver rotor actuated by said resultant magnetic field to an angular position corresponding to the direction of the magnetic'field at said transmitter.

5. In combination, a transmitter of the alternating current type comprising a stator having an annular core of magnetically permeable material provided with an alternating current input winding wound around its circumference and a plurality of equally angularly spaced alternating current output windings in inductive relation' with said input winding, a rotor comprising a rotatable magnet in magnetic relation with said core and windings for inducing a unidirectional flux in said core, a source of alternating current connected to said input winding i'oiperiodically varying the uni-directional flux in said core, whereby an alternating voltage is inducted in each of said output windings which is an even harmonic of the fundamental frequency of said source and the magnitude of which is a function of the angular position of said magnet rotor with respect to saidcore, and a remote receiver of the alternating current type comprising a stator having an annular core of insulating material, an energizing winding wound around said core oi insulating material, a plurality of other windings wound on said core of insulating material in inductive relation with said energizing winding and corresponding in number to the plurality of output windings of said transmitter, the output windings of said transmitter being electrically connected to the corresponding plurality of windings of said receiver, a frequency multiplier having its input connected to the said source of alternating current and its output to the energizing winding of said receiver whereby the plurality of windings of said receiver produces a resultant magnetic field having an angular direction corresponding to the angular position of the transmitter magnet rotor, and a receiver rotor actuated by said resultant field to an angular position corresponding to the angular position of said transmitter rotor.

6. In combination, a transmitter oi the alter nating current type comprising a stator having an annular core of magnetically permeable material provided with an alternating current input winding wound around its circumference and a plurality of equally angularly spaced alternating current output windings in inductive relation with said input winding, a rotor comprising a rotatable magnet in magnetic relation with said core and windings for inducing a uni-directional flux in said core, a source of alternating current connected to the said input winding for periodically varying the unidirectional flux in said core, whereby an alternating voltage is induced in each of said output windings which has a frequency twice that of the fundamental frequency of said source and the magnitude of which is a function of the relative angular position of said magnet rotor with respect to said core, and a remote receiver of th alternating current type comprising a stator having an annular core of insulating material, an energizing winding wound around said core oi insulating material, a plurality of other windings wound on said core of insulating material in inductive relation with said energizing winding and corresponding in number to the plurality of out put windings of said transmitter, th output windings of said transmitter being electrically connected to the corresponding plurality of windings of said receiver, a frequency doubler having its input connected to the said source of alternating current and its output to the energizing winding of said receiver whereby the plurality of windings of said receiver produces a resultant magnetic field having an angular direction corresponding to the angular position of the transmitter magnet rotor, and a receiver rotor actuated by said resultant held to an angular position corresponding to the angular position of said transmitter rotor.

7. In combination, a transmitter having a core of magnetically permeable material adapted to be traversed by a uni-directional magnetic field and provided with coil means thereon having an input and a plurality of outputs, a source of alternating current connected to the input oi said coil means, and a remote receiver having a core of insulating material provided with coil means thereon, corresponding to the coil means of said transmitter, means connecting the outputs of said transmitter coil means to corresponding connections of said receiver coil means a frequency multiplier having its input connected to said source and its output connected to the input of the coil means of said receiver and a rotor actuated by said receiver coil means JOEL D. PETERSON. 

